When i turn my car on new stereo system screams very high pitch?

Question

When i turn my car on new stereo system screams very high pitch?

Answer 1

boy that sucks

Answer 2

sounds like a bad earth wire

Answer 3

then keep it down!!

Answer 4

if you have an amp going to your mids and highs, turn the gain down gradually until it goes away. i had the same problem and this worked for me

Answer 5

check the ground wires.